Preliminary Report On the Building Stones of Nevada Including a Brief Chapter O
Preliminary Report On the Building Stones of Nevada Including a Brief Chapter O
John Allen Reid
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Much resistance to atmospheric changes is given, so that long life to a structure of this material is assured. The quarry cut is directly on the railroad, so that any amount needed can be easily obtained, the railroad, of course, owning the land. This stone was much used in the early days on the Comstock, chiefly for foundations. It shows no evidence of change where so used. The railroad now constructs of it abutments, culverts, retaining \valls and other similar structures. 2. The second quart...z-porphyry is quarried five-eights of a mile east of the tunnel already mentioned. The color in the mass is a medium dark purplish, which color is a not inconsiderable factor in the worth of the stone. The texture like that of the other, is porphyritic, with well developed crystals of quartz, feld- spar, and dark mica. The color is due to the purplish-gray ground mass, in which the other minerals show distinctly. The main difference between these two rocks is in the color, and the increase In the amount of mica in the purplish variety.
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